Competition - Cartels - Market in calcium carbide and magnesium for the steel and gas industries in the EEA, with the exception of Ireland, Spain, Portugal and the United Kingdom - Decision finding an infringement of Article 81 EC - Price fixing and market sharing - Fines - Principle of the legality of criminal offences and penalties - 2006 guidelines for the calculation of the amount of fines - Mitigating circumstances - Cooperation during the administrative procedure - Proportionality - Ability to pay.